Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d684d5f885f06f3…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 18:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: caba8f4ae1226cafbd219ede9d8518e2 SHA-1: 3e9f581ac6f726118da26b198cb0eb6e4d604967 SHA-256: 2d684d5f885f06f30e977d208eb664263901e31eb787c9eb9c09460c84a65921
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, likely for SEO poisoning or to host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/437dfd8830723eb46fb658367d63f31a/57767494656.pdf In PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/kejuroguv.pdfIn PDF document text
    • http://innotack.com/userfiles/files/67534946873.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/nenoxaralewemujuselator.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/31187521205.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/14078186029.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/22901704246.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109101224119291.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b149f4ddde---xubawera.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/pufunavunolivopipeg.pdfIn PDF document text
    • https://trainova.com/userfiles/file/mugubunovep.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/72914829190.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5b19ca1c772d52698eaf57bb2b2f0be6/ludatoxusisepoxabolabod.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d8015010cfca5a219b168087d8b22789/xifewem.pdfIn PDF document text
    • https://phunhai.net/upload/files/49555907999.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/34294617005.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/23224178922.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/75427482199.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/nubabofa.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/kelovoraxigagitugetur.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/gowewozowipogitak.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazobafofoneviv.pdfIn PDF document text
    • https://tarsiman.ee/files/file/55692747634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=friday+night+funkin+among+us+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE23 15156 bytes
SHA-256: 2396226f372de9e2744e0cdc2b963c13268f291026652a336ba1be07788ff44c
font_01_sfnt_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 11048 bytes
SHA-256: 775b55d5914d8ed3f85f7f6172fd1713393eacc0a7c620e5b05c352caac41e66